Steel tube

Details Steel tube Steel tube

F - Mech Eng,Light,Heat,Weapons

16

L

189/71

F16L 9/00 (2006.01) C23C 8/00 (2006.01) C23C 8/48 (2006.01) C23C 8/50 (2006.01) C23C 8/80 (2006.01) F02M 55/02 (2006.01) F16L 9/02 (2006.01) F16L 11/16 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1185194

ABSTRACT A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is formed by a diffusion layer which comprises a solid solution of nitrogen formed by tufftriding, and which is completely free from any intermetallic compounds, i.e. Fe3N and Fe4N. A method of manufacturing such a tube is also disclosed, and comprises tufftriding a steel tube in a molten bath of sodium cyanide while it is being axially vibrated, to form the diffusion layer, and heat treating the tube in a gaseous atmosphere to decompose any intermetallic compound on the diffusion layer.

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